<template>
    <div>
        <!-- 面包屑导航区域 -->
        <el-breadcrumb separator="/">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item>添加商品</el-breadcrumb-item>
        </el-breadcrumb>

        <!-- 卡片视图区域 -->
        <el-card>
            <!-- 提示区域 -->
             <el-alert
                title="添加商品信息"
                type="info"
                center
                show-icon
                :closable="false">
            </el-alert>
            <!-- 步骤进度条 -->
            <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
                <el-step title="基本信息"></el-step>
                <el-step title="商品参数"></el-step>
                <el-step title="商品属性"></el-step>
                <el-step title="商品图片"></el-step>
                <el-step title="商品内容"></el-step>
                <el-step title="完成"></el-step>
            </el-steps>
            <!-- tab栏区域 -->
            <!-- el-form外层包裹el-tabs -->
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px"
            label-position="top">
                <!-- v-model 的值只能是一个变量，是无法应用 filter、三元表达式等的 -->
                <el-tabs tab-position="left" v-model="activeIndex" :before-leave="beforeTabLeave"
                @tab-click="tabClicked">
                    <el-tab-pane label="基本信息" name="0">
                        <el-form-item label="商品名称" prop="goods_name">
                        <el-input v-model="addForm.goods_name"></el-input>
                        </el-form-item>
                        <el-form-item label="商品价格" prop="goods_price">
                        <el-input v-model="addForm.goods_price" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品重量" prop="goods_weight">
                        <el-input v-model="addForm.goods_weight" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品数量" prop="goods_number">
                        <el-input v-model="addForm.goods_number" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品数量" prop="goods_cat">
                            <el-cascader
                            v-model="addForm.goods_cat"
                            :options="cateList"
                            :props="cascaderProps"
                            @change="handleChange"
                            clearable>
                            </el-cascader>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品参数" name="1">
                        <!-- 渲染表单的Item项 -->
                        <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
                        <!-- 复选框组 -->
                        <el-checkbox-group v-model="item.attr_vals">
                            <el-checkbox :label="cb" v-for="(cb, i) in item.attr_vals" :key="i" border></el-checkbox>
                        </el-checkbox-group>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品属性" name="2">
                        <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
                        <el-input v-model="item.attr_vals"></el-input>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品图片" name="3">
                        <el-upload
                        action="uploadURL"
                        :on-preview="handlePreview"
                        :on-remove="handleRemove"
                        list-type="picture"
                        :headers="headerObj"
                        :on-success="handleSuccess">
                            <el-button size="small" type="primary">点击上传</el-button>
                        </el-upload>
                    </el-tab-pane>
                    <el-tab-pane label="商品内容" name="4">
                        <!-- 富文本编辑框 -->
                        <quill-editor
                        v-model="addForm.goods_introduce"
                        />
                        <!-- 添加商品的按钮 -->
                        <el-button type="primary" class="btnAdd" @click="add">
                            添加商品
                        </el-button>
                    </el-tab-pane>
                </el-tabs>
            </el-form>
        </el-card>

        <!-- 图片预览 -->
        <el-dialog title="图片预览" :visible.sync="previewVisible" width="50%">
        <img :src="previewPath" alt="" class="previewImg">
        </el-dialog>
    </div>
</template>
<script>
import _ from 'lodash'

export default {
    data() {
        return{
            activeIndex: '0',
            // 添加商品的表单数据对象
            addForm: {
                goods_name: '',
                goods_price: 0,
                goods_weight: 0,
                goods_number: 0,
                // 商品所属的分类数组
                goods_cat: [],
                // 图片的数组
                pics: [],
                // 商品的详情描述
                goods_introduce: '',
                attrs: []
            },
            // 添加商品的表单数据验证对象
            addFormRules: {
                goods_name: [
                { required: true, message: '请输入商品名称', trigger: 'blur' }
                ],
                goods_price: [
                { required: true, message: '请输入商品价格', trigger: 'blur' }
                ],
                goods_weight: [
                { required: true, message: '请输入商品重量', trigger: 'blur' }
                ],
                goods_number: [
                { required: true, message: '请输入商品数量', trigger: 'blur' }
                ],
                goods_cat: [
                { required: true, message: '请选择商品分类', trigger: 'blur' }
                ]
            },
            addFormRef: {},
            // 商品分类的列表
            cateList: [],
            // 选择级联选择器的配置对象
            cascaderProps: {
                expandTrigger: 'hover',
                value: 'cat_id',
                label:'cat_name',
                children: 'children'
            },
            // 动态参数列表数据
            manyTableData: [],
            // 静态属性列表数据
            onlyTableData: [],
            // 上传图片的URL地址
            uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
            // 图片上传组件的headers请求头对象
            headerObj: {
                Authorization:
                window.sessionStorage.getItem('token')
            },
            previewVisible: false,
            previewPath: ''
        }
    },
    created() {
        this.getCateList()
    },
    methods: {
        async getCateList() {
        const { data: res } = await this.$http.get('categories')

        if (res.meta.status !== 200) {
            return this.$message.error('获取商品分类数据失败！')
        }

        this.catelist = res.data
        console.log(this.catelist)
        this.seclectedKeys = res.data.children
        },
        // 级联选择器选中项发生变化时，会触发这个函数
        handleChange() {
            console.log(this.addForm.goods_cat)
            if (this.addForm.goods_cat.length !== 3) {
                this.addForm.goods_cat = []
            }
        },
        beforeTabLeave(activeName, oldActiveName) {
            // console.log('即将离开的标签页：' + activeName)
            // console.log('即将进入的标签页：' + oldActiveName)
            // if(oldActiveName === '0' && this.addForm.goods_cat.length !== 3){
            //     this.$message.error('请先选择商品分类')
            //     return false
            // }
        },
        async tabClicked() {
            // console.log(this.activeIndex)
            // 证明访问的是动态参数面板
            if (this.activeIndex === '1') {
                const { data: res } = await this.$http.get(
                `categories/${this.cateId}/attributes`,
                {
                    params: { sel: 'many' }
                }
                )

                if (res.meta.status !== 200) {
                return this.$message.error('获取动态参数列表失败！')
                }

                console.log(res.data)
                res.data.forEach(item => {
                item.attr_vals =
                    item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
                })
                this.manyTableData = res.data
            } else if (this.activeIndex === '2') {
                const { data: res } = await this.$http.get(
                `categories/${this.cateId}/attributes`,
                {
                    params: { sel: 'only' }
                }
                )

                if (res.meta.status !== 200) {
                return this.$message.error('获取静态属性失败！')
                }

                console.log(res.data)
                this.onlyTableData = res.data
            }
        },
        // 处理图片预览效果
        handlePreview(file) {
        console.log(file)
        this.previewPath = file.response.data.url
        this.previewVisible = true
        },
        // 处理移除图片的操作
        handleRemove(file) {
        // 1. 获取将要删除的图片的临时路径
        const filePath = file.response.data.tmp_path
        // 2. 从 pics 数组中，找到这个图片对应的索引值
        const i = this.addForm.pics.findIndex(x => x.pic === filePath)
        // 3. 调用数组的 splice 方法，把图片信息对象，从 pics 数组中移除
        this.addForm.pics.splice(i, 1)
        console.log(this.addForm)
        },
        // 监听图片上传成功的事件
        handleSuccess(response) {
        console.log(response)
        // 1. 拼接得到一个图片信息对象
        const picInfo = { pic: response.data.tmp_path }
        // 2. 将图片信息对象，push 到pics数组中
        this.addForm.pics.push(picInfo)
        console.log(this.addForm)
        },
        // 添加商品
        add() {
        this.$refs.addFormRef.validate(async valid => {
            if (!valid) {
            return this.$message.error('请填写必要的表单项！')
            }
            // 执行添加的业务逻辑
            // 表单中的级联选择器双向绑定到this.addForm.goods_cat上
            // 如果直接转化为字符串上传会报错，所以深拷贝
            // lodash   cloneDeep(obj)
            const form = _.cloneDeep(this.addForm)
            form.goods_cat = form.goods_cat.join(',')
            // 处理动态参数
            this.manyTableData.forEach(item => {
                // API文档attrs只包含attr_id和attr_value 注意attr_value是字符串
            const newInfo = {
                attr_id: item.attr_id,
                attr_value: item.attr_vals.join(' ')
            }
            this.addForm.attrs.push(newInfo)
            })
            // 处理静态属性 静态属性的attr_vals本来就是字符串
            this.onlyTableData.forEach(item => {
            const newInfo = { attr_id: item.attr_id, attr_value: item.attr_vals }
            this.addForm.attrs.push(newInfo)
            })
            form.attrs = this.addForm.attrs
            console.log(form)

            // 发起请求添加商品
            // 商品的名称，必须是唯一的
            const { data: res } = await this.$http.post('goods', form)

            if (res.meta.status !== 201) {
            return this.$message.error('添加商品失败！')
            }

            this.$message.success('添加商品成功！')
            this.$router.push('/goods')
        })
        }
    },
    computed: {
        cateId() {
        if (this.addForm.goods_cat.length === 3) {
            return this.addForm.goods_cat[2]
        }
        return null
        }
    }
}
</script>
<style lang="less" scoped>
.el-checkbox {
  margin: 0 10px 0 0 !important;
}

.previewImg {
  width: 100%;
}
.btnAdd {
  margin-top: 15px;
}
</style>